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Giuseppe Calandrelli noted stellar parallax in 1805-6 and came up with a 4-second value for the star Vega which was a gross overestimate. [3] The first successful stellar parallax measurements were done by Thomas Henderson in Cape Town South Africa in 1832–1833, where he measured parallax of one of the closest stars, Alpha Centauri.
2006-09-24 02:09 Srain 496×825× (18101 bytes) Edit by original author - page size fit to image. 2006-09-24 00:49 Srain 744×1052× (16975 bytes) This image is an altered version of Stellarparallax2.svg, which is an SVG version of Stellarparallax2.png. Stellarparallax2.svg was released into the public domain by its creator, [[Booyabazooka]].
2006-05-30 21:21 Booyabazooka 385×784×0 (15775 bytes) :''This image is a vector version of [[:Image:Stellarparallax2.png]]'' Stellar Parallax diagram The apparent motion of a near by star is a small ellipse in the sky relative to background stars over the period of a year. The angle representing major axi
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A parsec is the distance from the Sun to an astronomical object that has a parallax angle of one arcsecond (not to scale). The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,265 astronomical units (AU), i.e. 30.9 trillion kilometres (19.2 trillion miles).
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